Quad push button switch



FIG. 1 is a top, front and right-side perspective view of a quad push button switch embodying my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof; and,

FIG. 5 is a top plan view thereof. 

The ornamental design for a quad push button switch, as shown. 